Java ThreadGroup setDaemon()方法

java.lang.ThreadGroup.setDaemon()?方法改變該線程組的守護進程的狀態。當其最后一個線程被停止或它的最后一個線程組被銷毀守護線程組會自動銷毀。

1 語法

public final void setDaemon(boolean daemon)

2 參數

daemon ：?如果為true，這標志著該線程組作為守護線程組;否則，標志著該線程組為正常。

3 返回值

此方法不返回任何值。

4 示例

package com.yiidian;

/**

* 一點教程網： http://www.yiidian.com

*/

/**

* Java ThreadGroup setDaemon()方法

*/

import java.lang.*;

public class ThreadGroupDemo implements Runnable

{

public static void main(String[] args) {

ThreadGroupDemo tg = new ThreadGroupDemo();

tg.func();

}

public void func() {

try {

// create a parent ThreadGroup

ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup");

// daemon status is set to true

pGroup.setDaemon(true);

// create a child ThreadGroup for parent ThreadGroup

ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup");

// daemon status is set to true

cGroup.setDaemon(true);

// create a thread

Thread t1 = new Thread(pGroup, this);

System.out.println("Starting " + t1.getName() + "...");

t1.start();

// create another thread

Thread t2 = new Thread(cGroup, this);

System.out.println("Starting " + t2.getName() + "...");

t2.start();

// returns true if this thread group is a daemon thread group

System.out.println("Is " + pGroup.getName() + " a daemon

ThreadGroup? " + pGroup.isDaemon());

System.out.println("Is " + cGroup.getName() + " a daemon

ThreadGroup? " + cGroup.isDaemon());

// block until the other threads finish

t1.join();

t2.join();

}

catch (InterruptedException ex) {

System.out.println(ex.toString());

}

}

// implements run()

public void run() {

for(int i = 0;i < 1000;i++) {

i++;

}

System.out.println(Thread.currentThread().getName() +

" finished executing.");

}

}

輸出結果為：

Starting Thread-0...

Starting Thread-1...

Is Parent ThreadGroup a daemonThreadGroup? true

Is Child ThreadGroup a daemonThreadGroup? true

Thread-0 finished executing.

Thread-1 finished executing.

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